Sewing machine for closing paper bags and the like



.Tune '19, 1934.

R. N. cuNDALL SEWING MACHINE FOR CLOSING PAPER BAGS ANI) THE LIKE onv/ 010% A TTORNE Y6' June 19, 1934. R. N. cuNDALL 1,963,652

SEWING MACHINE FoRpLosING PAPER BAGS AND THE LIKE Filed Dec.. 28, 1932 2 Sheets-Sheet 2 Patented June 19, 1934 SEWING MACHINE FOR CLOSING PAPER BAGS AND THE LIKE Robert N. Cundall, Hamburg, N. Y.,

assigner to Consolidated Packaging Machinery Corp., Buffalo, N. Y., a. corporation of New York 1 Application December 28, 1932, Serial No. 649,128

6 Claims.

This invention relates to a sewing machine for sewing the ends or mouths of paper bags and more particularly to a sewing machine for sewing a stitched seam to secure the walls of the bag together adjacent their ends and also to provide a reinforcing cord of resilient material interlaced with the stitches of said seam, this cord yieldingly resisting any tendency of the bag walls to separate.

The principal object of this invention is to provide, in conjunction with a sewing machine, a simple, reliable and eic'ient mechanism for interlacing a reinforcing cord in the stitching on' opposite sides of a paper bag, the stitching em'- bracing the reinforcing cords whereby the cords yieldingly resist any tendency of the bag walls to separate and avoid the danger of the contents of the bag leaking vpast the stitching. Another object of the present invention is to provide a mechanism of this character which is applicable to any type of sewing machine and can be readily incorporated in any standard type of sewing machine.

Another purpose is to provide such a. mechanism which does not in any way interfere with the operation of the stitching mechanism of the sewing machine thereby enabling the same sewing machine to be used for ordinary stitching as well as enabling it to be used to provide the resilient reinforcing cord interlaced with the stitching.

In the accompanying drawings:

Fig. 1 is a side elevation of a sewing machine embodying my invention. V

Fig. 2 is a front elevation thereof. Fig. 3 is a fragmentary rear elevation thereof.

Fig. 4 is a vertical, transverse section taken on line 4 4, Fig. 2.

Fig. 5 is a fragmentary sectional elevation taken on line 5 5, Fig, 2.

`In its general organization this invention c omprises a sewing machine having the usual needle and looper and also having means for feeding a cord of resilient material to opposite sides of the bag to be stitched adjacent the needle vand means for moving the last named means alternately to opposite sides of the needle as it reciprocates so that the resilient cords are interlaced with the stitching on opposite sides of the bag, the stitching embracing and. drawing .the cord tightly against the walls of the bag s'othat the cord yieldingly resists any tendency of the bag walls to separate. l

The sewing machine in connection with which my invention Vcan be used can be of any usual and 55 well known form, that shown in the accompanying drawings being a sewing machine which sews aw chain stitch with an interlocking thread. The sewing machine is adapted to sew along the mouth 11 of the bag, the stitching passing through the opposite sides of the bag at its mouthso that the mouth of the bag is securely closed.

The operating parts of the sewing machine are shown as carried by a stationary frame 12 carrying a horizontal crank shaft 13 which is driven s by a. pulley 14, this crank shaft having the usual iiy wheel 15. 'I'his crank shaft also carries a cam 16 which lreciprocates a rock lever 17 pivoted at its center to the frame 12, as indicated at 18. The lower end of this rock lever is operatively con- )nected 'to a horizontally sliding rod or needle 70 holier'19 by suitable linkage 20, this needle holder carrying the horizontally reciprocating needle 21.

'I'he thread 22 for the needle passes over a tension adjusting device, indicated generally at 23, and through a stationary tube 24 to a thread take-up indicated generally at 25, this thread take-up being mounted adjacent the rear end of the reciprocating rod 19 and forming the subject matter of the copending application of Paul Kuhlig for Thread take-up for sewing machines,

Ser. No. 646,436 led December 9, 1932.v From the thread take-up the thread 22 passes through guide eyes to the eye of the .needle in the usual and well-known manner.

The sewing machine is also provided with the usual presser foot 26 which is yieldingly held against the side of that part of the bag being stitched by a spring 27. The sewing machine is also provided with the usual thread cut off which is driven from a pulley 29 on the crank shaft 13 by means of a belt 30 which passes around another pulley 3 1.

The looper 32 is carried at one end of a horil zontal arm 33 which is xedly clamped to the 95 lower end of a connecting rod 34. The upper end of this connecting rod 34 is secured to the crank 35 on the crank shaft 13 and the connecting rod 34 is guided, intermediate its ends, by a pivoted block 36, this block being pivoted, as at 37, so that it is free to turn about a horizontal axis, lengthwise of ,the shaft 13. As an auxiliary means for rocking the block 36 and avoiding wear between the connecting rod 34 and the swinging block 36, aleaf spring33 is also preferably se- 105 cured to the side ofthe connecting rod 34 and bears against onek side of the block v36. The thread 39 to the looper 32 can be fed in any suitable manner. The mounting of the looper 32 in vthis manner gives the required vverticalLmotion to the looper in entering the loop formed by the needle and also gives it the necessary horizontal movementl for drawing this loop along the stitch line and for forming the triangle which is entered by the needle on the next succeeding forwardv stroke. s

The sewing machine shown is also provided with the usual feed mechanism which consists of a feed dog (not shown) which is carried at the lower end of a vertical lever '70. This vertical lever '10 is pivoted at its center as indicated at rIl so that it has both lateral andpfore and aft movement .and at its top this lever is guided in its movement by an eccentric '72 having a cam groove 73. Theeccentric 72 and the cam groove 73 are designed to give the feed dog (not shown) the required movement to advance the mouth of the bag after each stitch and then'fretract away from the mouth of the bag and to its original position for its next succeeding operative stroke.

The mouth 11 of the bag is fed between the needle and the looper and is advanced horizontally in the usual and well known manner. During the sewing operation a reinforcing cord of resilient material, preferably twisted paper, is

l, interlaced with the stitching. One of these cords 42 is applied on that side of the bag which is arranged adjacent the needle 21 and the other of these cords 43 is fed on that side of the bag adjacent the looper 32. The cord 42 is fed from any suitable tension adjusting means (not shown) to a tubular guide 44 mounted on the end of an arm 45, this arm being secured to a rock shaft 46. The tubular guide 44 is arranged adjacent the side of the bag and extends lengthwise of the stitching. Each time the needle is projected through the bag the guide tube 44 is moved to one side, above or below, of the needle and the next time the needle is projected through the bag it is moved to the opposite side of the needle. 'I'his movement of the tubular guide 44 insures the interlacing of the reinforcing cord in the stitching and at the same time the stitching does not pass through the reinforcing cord and the stitching proceeds in a straight line without varying the position or usual movement of the needle.

'Since theA resilient reinforcing cord 42 is relatively heavy as compared with the thread from the sewing machine, the reinforcing cord in the finished seamV is straight and the stitching of the sewing machine takes a zig-zag form. It 'is apparenighoweven, that if the reinforcing cord were lighter, this cord would follow a zig-zag line in the finished seam and the loops of the stitches would be straight. An essential feature of the present invention is, however, that the stitching proceeds in a straight line in the usual manner, the reinforcing cord being moved from side ,to side in synchronism with the movement `Vof the needle. A

The means for moving the tubular guide 44 above and below the seam being stitched in synchronism with the movement of the needle comprises a pinion 50 on the crankzshaft 13 which meshes with a gear 51. The gear 51 has twice the number of teeth as the pinion 50 and is fixed to a shaft 52, this shaft being carried in suitable bearings secured to the main frame. The opposite end of the shaft 52, as best shown in Figs. 1 and 3, carries a wheel 53 having a crank pin 54. This crank pin is connected by a link 55 with a rock arm 56, this rock arm being fixed to the rock shaft 46 which carries the tubular guide 44.

Y It is therefore apparent that as the needle reciprocates the tubular guide is moved first to on@ side and then to the other of the stitching and to the opposite side above and below the needle so that the reinforcing cord 42 is firmly interlaced4 sides of the needle and between the looper and.

the bag so that the looping and stitching embraces the cord 43 on this side of the bag and holds the cord firmly against the bag. For this purpose the tubular guide 60 is pivoted to one side of its center as indicated at 61 so that the outlet end of the guide can feed the cord 43 either above or below the needle as it is projected through the bag. The inlet endA of the tubular guide 60 is connected by a link 62 with one end of a lever 63, this lever 63 being pivotally mounted intermediate its ends, as indicated at 64. The other end of the lever 63 is connected by a link 65 with a crank pin or screw 66 on the gear 51. In order to hold the ink 65 in operative position a tension spring 67 connects the end of the arm 63 and link 65 with the frame of the sewing machine.

From .the foregoing it is apparent that the present'` invention provides a sewing machine which will securelyinterlace a resilient cord'in the stitched seams securing the walls of a bag together and that the cord so interlaced yieldingly resists any tendency of the bag walls to separate. AIt is also apparent that this is accomplished by a very simple mechanism which can be adapted to any type of sewing machine and that by moving the reinforcing cords back and forth alternately on opposite sides of -the needle the stitching is never required to pass through the reinforcing cord. It is also apparent that the application of the present invention to a sewing machine does not prevent its being used when itis not desired to have the reinforcingV cord nor does the application ofthe present invention toa sewing machine require any elaborate redesigning of the sewing machine.

I claim as my invention:

1. A heavy duty single stitch sewing machine for closing the ends of multi-walled bags and the like, comprising a machine' frame, a main drive shaft journalled in said machine frame, a needle bar mounted in said machine frame for reciprocation parallel with said main drive shaft, .a needle carried by said needle holder, means for reciprocatingcsaid vneedle holder, a, looper arranged adjacent the point of said needle, means for actuating said looper, means for feeding IJheavy duty bags between said needle and looper, means for supplying thread to said needle and looper, means for feeding a cord along the line of stitching, means for moving said cord to opposite sides of said needle in synchronism with said needle each time said needle is reciprocated whereby said cord is interlaced with said stitching without penetration by said needle and means for impressing sufficient tension on said needle and looper thread to draw saidcord tightly against the wall of said bag,to form a resilient seal for the mouth thereof.

2. A heavy duty single. stitch sewing machine for closing the ends of multi-Walled bags and the like, comprising a machine frame, a horizontal main drive shaft journalled in said machine frame, a needle bar\mounted in said machine frame for reciprocation parallel with said main drive shaftta needle having a closed eye carried iis iso

by said needle holder, means for reciprocating said needle holder through motion derived from said parallel main shaft, a looper arranged adjacent the point of said needle, means for actuating said looper through motion derived from' said main shaft, means for feeding heavy duty bags between said needle and looper, means for feeding thread to said needle and looper, means for feeding a cord along the line of stitching, means for moving said cord vertically to opposite sides of said needle in synchronism with said needle each time said needle is reciprocated whereby said cord is interlaced with said stitching without penetration by said needle and means for impressing suflicient tension on said needle and looper thread to draw said cord .tightly against the wall of said bag to form a resilient seal for the mouth thereof.

3. A heavy duty single stitch sewing machine for closing the ends of multi-walled bags and the like, comprising a machine frame, a horizontal main drive shaft journalled in said machine frame, a needle bar mounted in said machine frame for reciprocation parallel with said main drive shaft, a needle having a closed eye carried by said needle holder, means for reciprocating said needle holder through motion derived from said parallel main shaft, a looper arranged adjacent the point of said needle, means for actuating said looper through motion derived from said main shaft, means for feeding heavy duty bags between said needle and looper, means for feeding thread to said needle and looper, means for feeding a twisted paper cord along the line of stitching, means for moving said cord vertically in a single plane at right angles tothe axis of said needle and to opposite sides of said needle in synchronism with said needle each time said needle is reciprocated whereby said cord is interlaced With said stitching without penetration by said needle and means for impressing suicient tension on said needle and looper thread to draw said cord tightly against the wall of said bag to form a resilient seal for the mouth thereof.

4. A heavy duty single stitch sewing machine for closing the ends of multi-walled bags and the like, comprising a machine frame, a horizontal main drive shaft journalled in said machine frame, a needle bar mounted in said machine frame for reciprocation parallel with said main drive shaft, a needle having a closed eye carried by said needle holder, means for reciprocating said needle holder through motion derived from said parallel main shaft, a looper arranged adjacent the point of said needle, means for actuating said looper through motion derived from said main shaft, means for feeding heavy duty bags between said needle and looper, means for feeding thread to said needle and looper, means for feeding a cord along the line of stitching, means for moving said cord vertically to opposite sides of said needle in synchronism with said needle each time said needle is reciprocated whereby said cord is interlaced with said stitching without penetration by said needle, means for impressing suicient tension on said needle and looper thread to draw said cord tightly against the wall of said bag to form a resilient seal for the mouth thereof and means for impressing a greater tension on said cord whereby said cord is drawn into a straight line and the stitch loops are drawn into angular relation with said cord.

5. A heavy duty single stitch sewing machine for closing the ends of multi-walled bags and the like, comprising a machine frame, a horizontal main drive shaft journalled in said machine frame, a horizontal needle bar mounted in said machine frame for reciprocation parallel with said main shaft, a needle having a closed eye carried by said needle holder, means for reciprocating said needle holder through motionv derived from said parallel main shaft, a looper arranged adjacent the point of said needle, means for actuating said looper through motion derived from said main shaft, means for feeding heavy duty bags between said needle and looper, means for vfeeding thread to said needle and looper, means for feeding a cord along the line of stitching on opposite sides of said bag, guide means -for each of said cords on each side of said bag, means ac-v tuated through motion derived from said main shaft for moving each of said guide means in a vertical plane rst to the upper side of said needle and on the succeeding reciprocation of said needle to the other side of said needle whereby said cords are interlaced with the stitching on opposite sides of said bag without penetration by said needle and means for impressing suflicient tension on said needle and looper thread to draw said cords tightly against the opposite sides of said bag to form a resilient seal for the mouth thereof. 3

6. A heavy duty single stitch sewing machine for closing the ends of multi-walled bags and the like, comprising a machine frame, a horizontal main drive shaft journalled in -said machine frame, a horizontal needle bar mounted in said machine frame for reciprocation parallel with said main shaft, a needle having a closed eye carried by said needle holdermeans for reciprocating said needle holder through motion derived from said parallel main shaft, a looper `arranged adjacent the point of said needle means for actuating said looper throughv motion derived from said main shaft, means for feeding heavy duty bags between said needle and looper, means for feeding thread to said needle and looper, means for feeding a cord along the line of stitching on opposite sides of said bag, guide means for each of said cords on each side of said bag, means actuated through motion derived from said main shaft for moving each of said guide means in a vertical plane rst to the upper side of said needle and onv the succeeding reciprocation of said needle to the other side of said needle whereby said cords are interlaced with the stitching on opposite sides of said bag without penetration by said needle comprising a pinion fast to said main shaft, a gear having twice the number of teeth rotatably mounted on said machine frame with its axis parallel with said main shaft and meshing with said pinion and link means connecting said gear with said guides andmeans for impressing suicient tension on said needle and looper thread to draw said cords tightly against the opposite sides of said bag to form a resilient seal for the mouth thereof.

ROBERT N. CUNDALL. 

